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Calculators / Biology / Population growth
Population growth calculator
Project exponential population change from a constant periodic rate.
On this page
Projected population1,628.89
Absolute change628.89
Calculator controls
How to calculate
Project exponential population change from a constant periodic rate.
future population = initial population × (1 + rate)^periods
Worked example
Initial population: 1000; Growth rate per period (%): 5; Number of periods: 10.
Projected population: 1,628.89 ; Absolute change: 628.89 .
Assumptions and limits
Constant exponential growth ignores carrying capacity, migration, age structure, seasonality, competition, and changing conditions.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Project exponential population change from a constant periodic rate. Every assumption remains visible so the result can be checked or changed.
When this tool is useful
Use the population growth for an initial estimate, comparison, or classroom calculation.
Understanding your inputs
| Input | What to enter |
|---|---|
| Initial population | Enter a number of at least 0 and no more than 1000000000000. |
| Growth rate per period (%) | Enter a number of at least -99.99 and no more than 10000. |
| Number of periods | Enter a number of at least 0 and no more than 1000. |
Frequently asked questions
What are the limits of this population growth?
Constant exponential growth ignores carrying capacity, migration, age structure, seasonality, competition, and changing conditions.
Can I use different units?
Use the units printed beside each field. Convert measurements first when your source uses different units.